Hong Kong-based crypto exchange OKEx CEO Chris Lee resigned just as it became the world’s biggest.

Lee left the company for personal reasons and also to “start a new life”, according to an emailed statement from OKEx. In a separate statement issued by Lee’s spokesman, the former CEO said it had been the “greatest pleasure and an honor” to work at OKEx. Lee will use his short break to spend more time with his family but promises to return to the blockchain community afterwards. Lee refused to reveal the reasons for his departure.

OKEx handled over $2 billion worth of virtual currency trades in the past 24 hours, making it the world’s most functional fee-charging cryptocurrency exchange, as per CoinMarketCap.com. OKEx has been gaining a lot of ground in the global ranking in the past few weeks. It has recently surpassed Binance as the biggest turnover.